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Relações trigonométricas gostaria da resolucao, por favor!
professor eu gostaria de saber como resolver essas questoes?
1°) Se tgx = 4, então qual é o valor da expressão ______cosx – senx____
sex – cossec x
????
2°) sabendo que 2cosx – 1= 0, quanto vale cotg2x ???
3°) qual o valor da expressao
4 tgx – 2cossecx
3 secx +2 , sabendo que senx=2, com 270°
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